title: Dye-sensitized solar cells based on TiO2-B nanobelt/TiO2 nanoparticle sandwich-type photoelectrodes with controllable nanobelt length.
abstract: The TiO(2)-B nanobelt (NB)/TiO(2) nanoparticle (NP) sandwich-type structure photoelectrode, with controllable nanobelt length, has been used to fabricate high-efficiency dye-sensitized solar cells (DSSCs), which combine the advantages of the rapid electron transport in TiO(2)-B NBs and the high surface area of TiO(2) NPs. The results indicate that the sandwich-type photoelectrode achieves higher photoelectrical conversion efficiency when compared with the TiO(2) nanoparticulate electrode. Increasing the length of TiO(2)-B NBs has been demonstrated to improve the photoelectric conversion efficiency (η). DSSCs with the longest (10 μm) TiO(2)-B NBs yield the highest η of 7.94%. The interfacial electron transport of DSSCs with different lengths of TiO(2)-B NBs has been quantitatively investigated using the photovoltage transient and the electrochemical impedance spectra, which demonstrates that the DSSCs with longest TiO(2)-B NBs display the highest electron collection efficiency and the fastest interfacial electron transfer.
authors.affiliation: Key Laboratory of Functional Inorganic Material Chemistry (Heilongjiang University), Ministry of Education, School of Chemistry and Materials Science, Heilongjiang University, Harbin 150080, People's Republic of China.
authors.forename: Youzhen
authors.initials: Y
authors.lastname: Dong
authors.forename: Kai
authors.initials: K
authors.lastname: Pan
authors.forename: Guohui
authors.initials: G
authors.lastname: Tian
authors.forename: Wei
authors.initials: W
authors.lastname: Zhou
authors.forename: Qingjiang
authors.initials: Q
authors.lastname: Pan
authors.forename: Tengfeng
authors.initials: T
authors.lastname: Xie
authors.forename: Dejun
authors.initials: D
authors.lastname: Wang
authors.forename: Honggang
authors.initials: H
authors.lastname: Fu